2.Journal of the American Chemical Society by American Chemical Society (1879)"well as for trimethyl(p-fluorophenyl)phosphonium tetra- fluoroborate (VI).'
In Table II are reported the a values for the sub- stituents X on ..."

3.Victor Von Richter's Organic Chemistry; Or, Chemistry of the Carbon by Victor von Richter, Richard Anschütz, Georg Schroeter (1900)"Hydrogen phosphide, PH,, has slight basic properties. It unites with HI to
phosphonium iodide, which is resolved again by water into its components. ..."

4.Victor Von Richter's Organic Chemistry; Or, Chemistry of the Carbon by Victor von Richter, Richard Anschütz, Georg Schroeter (1899)"It unites with HI to phosphonium iodide, which is resolved again by water into
its components. The phosphorus bases or phosphines, obtained by the ..."